Chapter 8. Administrative Controls
Chapter 1 classified the routing processes running on every router into three categories: (1) the processes responsible for running the routing protocols (EIGRP, OSPF, etc.); (2) the processes that take routing information from these routing protocols and build the routing table, exchange (redistribute) routing information between routing protocols, and filter routing information between peers; and (3) the processes involved with the forwarding of IP packets.
The bulk of this book is devoted to the description of routing protocols, which constitute the first set of processes. The third set of processes uses the rules of longest prefix match and classful versus classless route-lookup behavior, which I have already discussed at length.
The second set of processes is constituted of the controls that an administrator can exert over the routing process. This chapter describes these controls, which span all routing protocols. Instead of discussing these controls separately in the context of each routing protocol, I have reserved this discussion for this chapter, where I will talk about these controls just once.
The most common administrative control is the filtering of routing information between peers, over interfaces, or between routing protocols. Routing information may be filtered for any number of reasons: to stop sending routing updates to servers, to partition the network, to prevent routing loops, etc. These administrative controls are described ...
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